The transfer of a methyl group from C-I 1 to C-12 in vitamin BI2 biosynthesis is shown, by a crossover experiment involving [ I ,I 1,17-(CD3)3]-labelled precursors, to occur in an intramolecular fashion; it is found that in Pseudomonas denitrificans, unlike Propionibacterium shermanii, no exchange of the ring A acetate oxygen atoms occurs during formation of the corrin ring.
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